MBP fan starts just because of external Monitor

I recently bought a 4k monitor to use as additional monitor for my MBP (15" Late '13 - the stronger one with the big CPU and two graphic cards). The monitor is connect via thunderbold.

I was really surprised (not in the positive way) to see that my MB starts making pretty annoying noise just after I plugged in the external Monitor.The temperatur of all parts jump up by at least 20° before the fans started and kept the system at a "normal" level. I protocolled it with a tool (see the picture).

Is this really the poor reality that I have to bear the noise when I want to use an external monitor? Even if nothing happens on that monitor?

(To interpret the picture: The first hour I worked with external monitor. While having lunch I turned it off. After lunch I just started the monitor and didn't do any click.)

I recently bought a 4k monitor to use as additional monitor for my MBP (15" Late '13 - the stronger one with the big CPU and two graphic cards). The monitor is connect via thunderbold.

I was really surprised (not in the positive way) to see that my MB starts making pretty annoying noise just after I plugged in the external Monitor.The temperatur of all parts jump up by at least 20° before the fans started and kept the system at a "normal" level. I protocolled it with a tool (see the picture).

Is this really the poor reality that I have to bear the noise when I want to use an external monitor? Even if nothing happens on that monitor?

(To interpret the picture: The first hour I worked with external monitor. While having lunch I turned it off. After lunch I just started the monitor and didn't do any click.)

Click to expand...

Unfortunately the dGPU is always in use on a 4 k monitor because it's connected to all the ports, it creates extra heat and that has to be cooled, no different to any other dGPU laptop.

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